/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.news;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.common.NewsModuleConstants;
import com.blandware.atleap.model.core.Role;
import com.blandware.atleap.model.news.NewsItem;
import com.blandware.atleap.search.SearchManager;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.service.news.NewsManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SelectRolesForm;
import com.blandware.atleap.webapp.util.news.NewsModuleWebConstants;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.springframework.orm.ObjectOptimisticLockingFailureException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;

/**
 * <p>Assigns Roles to news item
 * </p>
 * <p><a href="AssignNewsItemRolesAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.14 $ $Date: 2006/08/03 10:08:03 $
 * @struts.action path="/news/assignItemRoles"
 * name="selectRolesForm"
 * scope="request"
 * input="inputForward"
 * validate="true"
 * roles="news-item-assignRoles"
 * @struts.action-forward name="viewNewsItem"
 * path="/news/viewItem.do"
 * redirect="true"
 * @struts.action-forward name="listNewsItems"
 * path="/news/listItems.do"
 * redirect="true"
 * @struts.action-forward name="callAssignRoles"
 * path="/news/callAssignItemRoles.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/news/listItems.do"
 */
public final class AssignNewsItemRolesAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		if ( !isCancelled(request) ) {
			// acquire POJOs for all selected roles
			RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);
			SelectRolesForm selectRolesForm = (SelectRolesForm) form;
			String[] selectedRoleNames = selectRolesForm.getSelectedRoles();

			List roles = new ArrayList();
			for ( int i = 0; i < selectedRoleNames.length; i++ ) {
				String roleName = selectedRoleNames[i];
				Role role = roleManager.retrieveRole(roleName);
				if ( role != null ) {
					roles.add(role);
				}
			}

			Long newsItemId = (Long) request.getSession().getAttribute(NewsModuleWebConstants.NEWS_ITEM_ID_KEY);
			NewsManager newsManager = (NewsManager) getBean(NewsModuleConstants.NEWS_MANAGER_BEAN);
			NewsItem newsItem = newsManager.retrieveNewsItem(newsItemId);

			if ( newsItem == null ) {
				// newsItem not found. it might be deleted by someone else
				ActionMessages errors = new ActionMessages();
				errors.add("newsItemNotFound", new ActionMessage("news.errors.notFound"));
				saveErrors(request, errors);
				return mapping.findForward("listNewsItems");
			}

			newsItem.setVersion(Long.valueOf(selectRolesForm.getVersion()));

			// remove roles which were unselected
			// list of roles is copied in order to prevent ConcurrentModifictionException to be thrown
			List newsItemRoles = new ArrayList(newsItem.getRoles());
			for ( int i = 0; i < newsItemRoles.size(); i++ ) {
				Role role = (Role) newsItemRoles.get(i);
				if ( !roles.contains(role) ) {
					newsItem.removeRole(role);
				}
			}

			// add new roles
			for ( Iterator i = roles.iterator(); i.hasNext(); ) {
				Role role = (Role) i.next();
				newsItem.addRole(role);
			}

			try {
				newsManager.updateNewsItem(newsItem);
			} catch ( ObjectOptimisticLockingFailureException e ) {
				// news item was updated or deleted by another transaction
				ActionMessages errors = new ActionMessages();
				errors.add("updateFailed", new ActionMessage("news.errors.updateFailed"));
				saveErrors(request, errors);
				request.setAttribute(NewsModuleWebConstants.NEWS_ITEM_ID_KEY, newsItem.getId());
				return mapping.findForward("callAssignRoles");
			}

			//index
			if ( newsItem.getActive().booleanValue() ) {
				SearchManager searchManager = SearchManager.getInstance(request.getSession().getServletContext());
				searchManager.reIndexPage(newsItem, request);
			}

		}
		return mapping.findForward("listNewsItems");
	}
}